【Battery Powered Fan】 The small portable fan is equipped with a built-in 7800mAh high-capacity battery, which can work for 5 to 20 hours and provide long-lasting freshness. It is very suitable for camping and barbecues. There are 4 indicator lights to show the current battery level. 【Solar Fan】 The rechargeable fan is equipped with a solar panel on the back and can be fully charged in a few hours under bright light. The camping fan also supports use while charging, promoting a carbon-free lifestyle. Note: The fan and solar panel must be separated when using. 【4 Adjustable Speed Levels】 The silent fan uses the latest brushless motor technology and ultra-thin fan blades to provide exceptional airflow and minimal noise. It offers 4 speeds to choose from (25%-50%-75%-100%). 【More Features】 The USB fan can be charged via a Type-C cable, and can also be used as a portable charger to charge your phone in an emergency; 4 LEDs are installed around the wireless fan, with 3 adjustable brightness